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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / compat.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
a2531293 11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
1da177e4
LT		 12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
85c9fe8f 18#include <linux/stddef.h>
022a1692 19#include <linux/kernel.h>
1da177e4
LT		 20#include <linux/linkage.h>
21#include <linux/compat.h>
22#include <linux/errno.h>
23#include <linux/time.h>
24#include <linux/fs.h>
25#include <linux/fcntl.h>
26#include <linux/namei.h>
27#include <linux/file.h>
9f3acc31 28#include <linux/fdtable.h>
1da177e4 29#include <linux/vfs.h>
1da177e4
LT		 30#include <linux/ioctl.h>
31#include <linux/init.h>
1da177e4 32#include <linux/ncp_mount.h>
9a9947bf 33#include <linux/nfs4_mount.h>
1da177e4
LT		 34#include <linux/syscalls.h>
35#include <linux/ctype.h>
1da177e4 36#include <linux/dirent.h>
0eeca283 37#include <linux/fsnotify.h>
1da177e4 38#include <linux/highuid.h>
1da177e4
LT		 39#include <linux/personality.h>
40#include <linux/rwsem.h>
8f0ab514 41#include <linux/tsacct_kern.h>
6272e266 42#include <linux/security.h>
a1f8e7f7 43#include <linux/highmem.h>
6d18c922 44#include <linux/signal.h>
bd01f843 45#include <linux/poll.h>
4a805e86 46#include <linux/mm.h>
498052bb 47#include <linux/fs_struct.h>
5a0e3ad6 48#include <linux/slab.h>
504b701b 49#include <linux/pagemap.h>
1da177e4 50
1da177e4
LT		 51#include <asm/uaccess.h>
52#include <asm/mmu_context.h>
53#include <asm/ioctls.h>
07f3f05c 54#include "internal.h"
9f72949f 55
bebfa101
AK		 56int compat_log = 1;
57
58int compat_printk(const char *fmt, ...)
59{
60 va_list ap;
61 int ret;
62 if (!compat_log)
63 return 0;
64 va_start(ap, fmt);
65 ret = vprintk(fmt, ap);
66 va_end(ap);
67 return ret;
68}
69
ee0b3e67
BP		 70#include "read_write.h"
71
1da177e4
LT		 72/*
73 * Not all architectures have sys_utime, so implement this in terms
74 * of sys_utimes.
75 */
c7887325
DH		 76asmlinkage long compat_sys_utime(const char __user *filename,
77 struct compat_utimbuf __user *t)
1da177e4 78{
1c710c89 79 struct timespec tv[2];
1da177e4
LT		 80
81 if (t) {
82 if (get_user(tv[0].tv_sec, &t->actime) ||
83 get_user(tv[1].tv_sec, &t->modtime))
84 return -EFAULT;
1c710c89
UD		 85 tv[0].tv_nsec = 0;
86 tv[1].tv_nsec = 0;
1da177e4 87 }
1c710c89
UD		 88 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
89}
90
c7887325 91asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
1c710c89
UD		 92{
93 struct timespec tv[2];
94
95 if (t) {
96 if (get_compat_timespec(&tv[0], &t[0]) ||
97 get_compat_timespec(&tv[1], &t[1]))
98 return -EFAULT;
99
1c710c89
UD		 100 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
101 return 0;
102 }
103 return do_utimes(dfd, filename, t ? tv : NULL, flags);
1da177e4
LT		 104}
105
c7887325 106asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
1da177e4 107{
1c710c89 108 struct timespec tv[2];
1da177e4 109
9ad11ab4 110 if (t) {
1da177e4 111 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
1c710c89 112 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
1da177e4 113 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
1c710c89 114 get_user(tv[1].tv_nsec, &t[1].tv_usec))
9ad11ab4 115 return -EFAULT;
1c710c89
UD		 116 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
117 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
118 return -EINVAL;
119 tv[0].tv_nsec *= 1000;
120 tv[1].tv_nsec *= 1000;
9ad11ab4 121 }
1c710c89 122 return do_utimes(dfd, filename, t ? tv : NULL, 0);
5590ff0d
UD		 123}
124
c7887325 125asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
5590ff0d
UD		 126{
127 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 128}
129
f7a5000f
CH		 130static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
131{
fcf83067 132 struct compat_stat tmp;
f7a5000f 133
fcf83067
AV		 134 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
135 return -EOVERFLOW;
f7a5000f 136
fcf83067
AV		 137 memset(&tmp, 0, sizeof(tmp));
138 tmp.st_dev = old_encode_dev(stat->dev);
139 tmp.st_ino = stat->ino;
140 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
f7a5000f 141 return -EOVERFLOW;
fcf83067
AV		 142 tmp.st_mode = stat->mode;
143 tmp.st_nlink = stat->nlink;
144 if (tmp.st_nlink != stat->nlink)
f7a5000f 145 return -EOVERFLOW;
a7c1938e
EB		 146 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
147 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
fcf83067
AV		 148 tmp.st_rdev = old_encode_dev(stat->rdev);
149 if ((u64) stat->size > MAX_NON_LFS)
150 return -EOVERFLOW;
151 tmp.st_size = stat->size;
152 tmp.st_atime = stat->atime.tv_sec;
153 tmp.st_atime_nsec = stat->atime.tv_nsec;
154 tmp.st_mtime = stat->mtime.tv_sec;
155 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
156 tmp.st_ctime = stat->ctime.tv_sec;
157 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
158 tmp.st_blocks = stat->blocks;
159 tmp.st_blksize = stat->blksize;
160 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
f7a5000f
CH		 161}
162
c7887325 163asmlinkage long compat_sys_newstat(const char __user * filename,
1da177e4
LT		 164 struct compat_stat __user *statbuf)
165{
166 struct kstat stat;
2eae7a18 167 int error;
1da177e4 168
2eae7a18
CH		 169 error = vfs_stat(filename, &stat);
170 if (error)
171 return error;
172 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 173}
174
c7887325 175asmlinkage long compat_sys_newlstat(const char __user * filename,
1da177e4
LT		 176 struct compat_stat __user *statbuf)
177{
178 struct kstat stat;
2eae7a18 179 int error;
1da177e4 180
2eae7a18
CH		 181 error = vfs_lstat(filename, &stat);
182 if (error)
183 return error;
184 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 185}
186
82d821dd 187#ifndef __ARCH_WANT_STAT64
c7887325
DH		 188asmlinkage long compat_sys_newfstatat(unsigned int dfd,
189 const char __user *filename,
5590ff0d
UD		 190 struct compat_stat __user *statbuf, int flag)
191{
192 struct kstat stat;
0112fc22 193 int error;
5590ff0d 194
0112fc22
OD		 195 error = vfs_fstatat(dfd, filename, &stat, flag);
196 if (error)
197 return error;
198 return cp_compat_stat(&stat, statbuf);
5590ff0d 199}
82d821dd 200#endif
5590ff0d 201
1da177e4
LT		 202asmlinkage long compat_sys_newfstat(unsigned int fd,
203 struct compat_stat __user * statbuf)
204{
205 struct kstat stat;
206 int error = vfs_fstat(fd, &stat);
207
208 if (!error)
209 error = cp_compat_stat(&stat, statbuf);
210 return error;
211}
212
213static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
214{
215
216 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 217 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
218 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 219 return -EOVERFLOW;
220 /* f_files and f_ffree may be -1; it's okay
221 * to stuff that into 32 bits */
222 if (kbuf->f_files != 0xffffffffffffffffULL
223 && (kbuf->f_files & 0xffffffff00000000ULL))
224 return -EOVERFLOW;
225 if (kbuf->f_ffree != 0xffffffffffffffffULL
226 && (kbuf->f_ffree & 0xffffffff00000000ULL))
227 return -EOVERFLOW;
228 }
229 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
230 __put_user(kbuf->f_type, &ubuf->f_type) ||
231 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
232 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
233 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
234 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
235 __put_user(kbuf->f_files, &ubuf->f_files) ||
236 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
237 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
238 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
239 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
240 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
1448c721
EB		 241 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
242 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
1da177e4
LT		 243 return -EFAULT;
244 return 0;
245}
246
247/*
974d879e 248 * The following statfs calls are copies of code from fs/statfs.c and
1da177e4
LT		 249 * should be checked against those from time to time
250 */
2d8f3038 251asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 252{
c8b91acc
AV		 253 struct kstatfs tmp;
254 int error = user_statfs(pathname, &tmp);
255 if (!error)
256 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 257 return error;
258}
259
260asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
261{
1da177e4 262 struct kstatfs tmp;
c8b91acc 263 int error = fd_statfs(fd, &tmp);
86e07ce7
DG		 264 if (!error)
265 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 266 return error;
267}
268
269static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
270{
271 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 272 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
273 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 274 return -EOVERFLOW;
275 /* f_files and f_ffree may be -1; it's okay
276 * to stuff that into 32 bits */
277 if (kbuf->f_files != 0xffffffffffffffffULL
278 && (kbuf->f_files & 0xffffffff00000000ULL))
279 return -EOVERFLOW;
280 if (kbuf->f_ffree != 0xffffffffffffffffULL
281 && (kbuf->f_ffree & 0xffffffff00000000ULL))
282 return -EOVERFLOW;
283 }
284 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
285 __put_user(kbuf->f_type, &ubuf->f_type) ||
286 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
287 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
288 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
289 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
290 __put_user(kbuf->f_files, &ubuf->f_files) ||
291 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
292 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
293 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
294 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
e0bb6bda
NK		 295 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
296 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
297 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
1da177e4
LT		 298 return -EFAULT;
299 return 0;
300}
301
2d8f3038 302asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 303{
c8b91acc 304 struct kstatfs tmp;
1da177e4
LT		 305 int error;
306
307 if (sz != sizeof(*buf))
308 return -EINVAL;
309
c8b91acc
AV		 310 error = user_statfs(pathname, &tmp);
311 if (!error)
312 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 313 return error;
314}
315
316asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
317{
1da177e4
LT		 318 struct kstatfs tmp;
319 int error;
320
321 if (sz != sizeof(*buf))
322 return -EINVAL;
323
c8b91acc 324 error = fd_statfs(fd, &tmp);
86e07ce7
DG		 325 if (!error)
326 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 327 return error;
328}
329
2b1c6bd7
CH		 330/*
331 * This is a copy of sys_ustat, just dealing with a structure layout.
332 * Given how simple this syscall is that apporach is more maintainable
333 * than the various conversion hacks.
334 */
335asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
336{
2b1c6bd7
CH		 337 struct compat_ustat tmp;
338 struct kstatfs sbuf;
cf31e70d 339 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
2b1c6bd7
CH		 340 if (err)
341 return err;
342
343 memset(&tmp, 0, sizeof(struct compat_ustat));
344 tmp.f_tfree = sbuf.f_bfree;
345 tmp.f_tinode = sbuf.f_ffree;
346 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
347 return -EFAULT;
348 return 0;
349}
350
1da177e4
LT		 351static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
352{
353 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
354 __get_user(kfl->l_type, &ufl->l_type) ||
355 __get_user(kfl->l_whence, &ufl->l_whence) ||
356 __get_user(kfl->l_start, &ufl->l_start) ||
357 __get_user(kfl->l_len, &ufl->l_len) ||
358 __get_user(kfl->l_pid, &ufl->l_pid))
359 return -EFAULT;
360 return 0;
361}
362
363static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
364{
365 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
366 __put_user(kfl->l_type, &ufl->l_type) ||
367 __put_user(kfl->l_whence, &ufl->l_whence) ||
368 __put_user(kfl->l_start, &ufl->l_start) ||
369 __put_user(kfl->l_len, &ufl->l_len) ||
370 __put_user(kfl->l_pid, &ufl->l_pid))
371 return -EFAULT;
372 return 0;
373}
374
375#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
376static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
377{
378 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
379 __get_user(kfl->l_type, &ufl->l_type) ||
380 __get_user(kfl->l_whence, &ufl->l_whence) ||
381 __get_user(kfl->l_start, &ufl->l_start) ||
382 __get_user(kfl->l_len, &ufl->l_len) ||
383 __get_user(kfl->l_pid, &ufl->l_pid))
384 return -EFAULT;
385 return 0;
386}
387#endif
388
389#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
390static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
391{
392 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
393 __put_user(kfl->l_type, &ufl->l_type) ||
394 __put_user(kfl->l_whence, &ufl->l_whence) ||
395 __put_user(kfl->l_start, &ufl->l_start) ||
396 __put_user(kfl->l_len, &ufl->l_len) ||
397 __put_user(kfl->l_pid, &ufl->l_pid))
398 return -EFAULT;
399 return 0;
400}
401#endif
402
403asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
404 unsigned long arg)
405{
406 mm_segment_t old_fs;
407 struct flock f;
408 long ret;
409
410 switch (cmd) {
411 case F_GETLK:
412 case F_SETLK:
413 case F_SETLKW:
414 ret = get_compat_flock(&f, compat_ptr(arg));
415 if (ret != 0)
416 break;
417 old_fs = get_fs();
418 set_fs(KERNEL_DS);
419 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
420 set_fs(old_fs);
421 if (cmd == F_GETLK && ret == 0) {
ff677f8d 422 /* GETLK was successful and we need to return the data...
2520f14c
N		 423 * but it needs to fit in the compat structure.
424 * l_start shouldn't be too big, unless the original
425 * start + end is greater than COMPAT_OFF_T_MAX, in which
426 * case the app was asking for trouble, so we return
427 * -EOVERFLOW in that case.
428 * l_len could be too big, in which case we just truncate it,
429 * and only allow the app to see that part of the conflicting
430 * lock that might make sense to it anyway
431 */
432
433 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 434 ret = -EOVERFLOW;
2520f14c
N		 435 if (f.l_len > COMPAT_OFF_T_MAX)
436 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 437 if (ret == 0)
438 ret = put_compat_flock(&f, compat_ptr(arg));
439 }
440 break;
441
442 case F_GETLK64:
443 case F_SETLK64:
444 case F_SETLKW64:
445 ret = get_compat_flock64(&f, compat_ptr(arg));
446 if (ret != 0)
447 break;
448 old_fs = get_fs();
449 set_fs(KERNEL_DS);
450 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
451 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
452 (unsigned long)&f);
453 set_fs(old_fs);
454 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 455 /* need to return lock information - see above for commentary */
456 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 457 ret = -EOVERFLOW;
2520f14c
N		 458 if (f.l_len > COMPAT_LOFF_T_MAX)
459 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 460 if (ret == 0)
461 ret = put_compat_flock64(&f, compat_ptr(arg));
462 }
463 break;
464
465 default:
466 ret = sys_fcntl(fd, cmd, arg);
467 break;
468 }
469 return ret;
470}
471
472asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
473 unsigned long arg)
474{
475 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
476 return -EINVAL;
477 return compat_sys_fcntl64(fd, cmd, arg);
478}
479
480asmlinkage long
481compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
482{
483 long ret;
484 aio_context_t ctx64;
485
486 mm_segment_t oldfs = get_fs();
487 if (unlikely(get_user(ctx64, ctx32p)))
488 return -EFAULT;
489
490 set_fs(KERNEL_DS);
491 /* The __user pointer cast is valid because of the set_fs() */
492 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
493 set_fs(oldfs);
494 /* truncating is ok because it's a user address */
495 if (!ret)
496 ret = put_user((u32) ctx64, ctx32p);
497 return ret;
498}
499
500asmlinkage long
501compat_sys_io_getevents(aio_context_t ctx_id,
502 unsigned long min_nr,
503 unsigned long nr,
504 struct io_event __user *events,
505 struct compat_timespec __user *timeout)
506{
507 long ret;
508 struct timespec t;
509 struct timespec __user *ut = NULL;
510
511 ret = -EFAULT;
512 if (unlikely(!access_ok(VERIFY_WRITE, events,
513 nr * sizeof(struct io_event))))
514 goto out;
515 if (timeout) {
516 if (get_compat_timespec(&t, timeout))
517 goto out;
518
519 ut = compat_alloc_user_space(sizeof(*ut));
520 if (copy_to_user(ut, &t, sizeof(t)) )
521 goto out;
522 }
523 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
524out:
525 return ret;
526}
527
b8373363
JM		 528/* A write operation does a read from user space and vice versa */
529#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
530
531ssize_t compat_rw_copy_check_uvector(int type,
532 const struct compat_iovec __user *uvector, unsigned long nr_segs,
533 unsigned long fast_segs, struct iovec *fast_pointer,
ac34ebb3 534 struct iovec **ret_pointer)
b8373363
JM		 535{
536 compat_ssize_t tot_len;
537 struct iovec *iov = *ret_pointer = fast_pointer;
538 ssize_t ret = 0;
539 int seg;
540
541 /*
542 * SuS says "The readv() function *may* fail if the iovcnt argument
543 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
544 * traditionally returned zero for zero segments, so...
545 */
546 if (nr_segs == 0)
547 goto out;
548
549 ret = -EINVAL;
550 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
551 goto out;
552 if (nr_segs > fast_segs) {
553 ret = -ENOMEM;
554 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
6a5640f1 555 if (iov == NULL)
b8373363 556 goto out;
b8373363
JM		 557 }
558 *ret_pointer = iov;
559
8aec0f5d
MD		 560 ret = -EFAULT;
561 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
562 goto out;
563
b8373363
JM		 564 /*
565 * Single unix specification:
566 * We should -EINVAL if an element length is not >= 0 and fitting an
435f49a5 567 * ssize_t.
b8373363 568 *
435f49a5
LT		 569 * In Linux, the total length is limited to MAX_RW_COUNT, there is
570 * no overflow possibility.
b8373363
JM		 571 */
572 tot_len = 0;
573 ret = -EINVAL;
574 for (seg = 0; seg < nr_segs; seg++) {
b8373363
JM		 575 compat_uptr_t buf;
576 compat_ssize_t len;
577
578 if (__get_user(len, &uvector->iov_len) ||
579 __get_user(buf, &uvector->iov_base)) {
580 ret = -EFAULT;
581 goto out;
582 }
583 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
584 goto out;
ac34ebb3 585 if (type >= 0 &&
fcf63409 586 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
b8373363
JM		 587 ret = -EFAULT;
588 goto out;
589 }
435f49a5
LT		 590 if (len > MAX_RW_COUNT - tot_len)
591 len = MAX_RW_COUNT - tot_len;
592 tot_len += len;
b8373363
JM		 593 iov->iov_base = compat_ptr(buf);
594 iov->iov_len = (compat_size_t) len;
595 uvector++;
596 iov++;
597 }
598 ret = tot_len;
599
600out:
601 return ret;
602}
603
1da177e4
LT		 604static inline long
605copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
606{
607 compat_uptr_t uptr;
608 int i;
609
610 for (i = 0; i < nr; ++i) {
611 if (get_user(uptr, ptr32 + i))
612 return -EFAULT;
613 if (put_user(compat_ptr(uptr), ptr64 + i))
614 return -EFAULT;
615 }
616 return 0;
617}
618
619#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
620
621asmlinkage long
622compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
623{
624 struct iocb __user * __user *iocb64;
625 long ret;
626
627 if (unlikely(nr < 0))
628 return -EINVAL;
629
630 if (nr > MAX_AIO_SUBMITS)
631 nr = MAX_AIO_SUBMITS;
632
633 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
634 ret = copy_iocb(nr, iocb, iocb64);
635 if (!ret)
9d85cba7 636 ret = do_io_submit(ctx_id, nr, iocb64, 1);
1da177e4
LT		 637 return ret;
638}
639
640struct compat_ncp_mount_data {
641 compat_int_t version;
642 compat_uint_t ncp_fd;
202e5979 643 __compat_uid_t mounted_uid;
1da177e4
LT		 644 compat_pid_t wdog_pid;
645 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
646 compat_uint_t time_out;
647 compat_uint_t retry_count;
648 compat_uint_t flags;
202e5979
SR		 649 __compat_uid_t uid;
650 __compat_gid_t gid;
1da177e4
LT		 651 compat_mode_t file_mode;
652 compat_mode_t dir_mode;
653};
654
655struct compat_ncp_mount_data_v4 {
656 compat_int_t version;
657 compat_ulong_t flags;
658 compat_ulong_t mounted_uid;
659 compat_long_t wdog_pid;
660 compat_uint_t ncp_fd;
661 compat_uint_t time_out;
662 compat_uint_t retry_count;
663 compat_ulong_t uid;
664 compat_ulong_t gid;
665 compat_ulong_t file_mode;
666 compat_ulong_t dir_mode;
667};
668
669static void *do_ncp_super_data_conv(void *raw_data)
670{
671 int version = *(unsigned int *)raw_data;
672
673 if (version == 3) {
674 struct compat_ncp_mount_data *c_n = raw_data;
675 struct ncp_mount_data *n = raw_data;
676
677 n->dir_mode = c_n->dir_mode;
678 n->file_mode = c_n->file_mode;
679 n->gid = c_n->gid;
680 n->uid = c_n->uid;
681 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
682 n->wdog_pid = c_n->wdog_pid;
683 n->mounted_uid = c_n->mounted_uid;
684 } else if (version == 4) {
685 struct compat_ncp_mount_data_v4 *c_n = raw_data;
686 struct ncp_mount_data_v4 *n = raw_data;
687
688 n->dir_mode = c_n->dir_mode;
689 n->file_mode = c_n->file_mode;
690 n->gid = c_n->gid;
691 n->uid = c_n->uid;
692 n->retry_count = c_n->retry_count;
693 n->time_out = c_n->time_out;
694 n->ncp_fd = c_n->ncp_fd;
695 n->wdog_pid = c_n->wdog_pid;
696 n->mounted_uid = c_n->mounted_uid;
697 n->flags = c_n->flags;
698 } else if (version != 5) {
699 return NULL;
700 }
701
702 return raw_data;
703}
704
1da177e4 705
9a9947bf
DH		 706struct compat_nfs_string {
707 compat_uint_t len;
5fc3e624 708 compat_uptr_t data;
9a9947bf
DH		 709};
710
711static inline void compat_nfs_string(struct nfs_string *dst,
712 struct compat_nfs_string *src)
713{
714 dst->data = compat_ptr(src->data);
715 dst->len = src->len;
716}
717
718struct compat_nfs4_mount_data_v1 {
719 compat_int_t version;
720 compat_int_t flags;
721 compat_int_t rsize;
722 compat_int_t wsize;
723 compat_int_t timeo;
724 compat_int_t retrans;
725 compat_int_t acregmin;
726 compat_int_t acregmax;
727 compat_int_t acdirmin;
728 compat_int_t acdirmax;
729 struct compat_nfs_string client_addr;
730 struct compat_nfs_string mnt_path;
731 struct compat_nfs_string hostname;
732 compat_uint_t host_addrlen;
5fc3e624 733 compat_uptr_t host_addr;
9a9947bf
DH		 734 compat_int_t proto;
735 compat_int_t auth_flavourlen;
5fc3e624 736 compat_uptr_t auth_flavours;
9a9947bf
DH		 737};
738
739static int do_nfs4_super_data_conv(void *raw_data)
740{
741 int version = *(compat_uint_t *) raw_data;
742
743 if (version == 1) {
744 struct compat_nfs4_mount_data_v1 *raw = raw_data;
745 struct nfs4_mount_data *real = raw_data;
746
747 /* copy the fields backwards */
748 real->auth_flavours = compat_ptr(raw->auth_flavours);
749 real->auth_flavourlen = raw->auth_flavourlen;
750 real->proto = raw->proto;
751 real->host_addr = compat_ptr(raw->host_addr);
752 real->host_addrlen = raw->host_addrlen;
753 compat_nfs_string(&real->hostname, &raw->hostname);
754 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
755 compat_nfs_string(&real->client_addr, &raw->client_addr);
756 real->acdirmax = raw->acdirmax;
757 real->acdirmin = raw->acdirmin;
758 real->acregmax = raw->acregmax;
759 real->acregmin = raw->acregmin;
760 real->retrans = raw->retrans;
761 real->timeo = raw->timeo;
762 real->wsize = raw->wsize;
763 real->rsize = raw->rsize;
764 real->flags = raw->flags;
765 real->version = raw->version;
766 }
9a9947bf
DH		 767
768 return 0;
769}
770
1da177e4 771#define NCPFS_NAME "ncpfs"
9a9947bf 772#define NFS4_NAME "nfs4"
1da177e4 773
c7887325
DH		 774asmlinkage long compat_sys_mount(const char __user * dev_name,
775 const char __user * dir_name,
776 const char __user * type, unsigned long flags,
777 const void __user * data)
1da177e4 778{
eca6f534 779 char *kernel_type;
1da177e4 780 unsigned long data_page;
eca6f534 781 char *kernel_dev;
91a27b2a 782 struct filename *dir;
1da177e4
LT		 783 int retval;
784
eca6f534 785 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 786 if (retval < 0)
787 goto out;
788
91a27b2a
JL		 789 dir = getname(dir_name);
790 retval = PTR_ERR(dir);
791 if (IS_ERR(dir))
1da177e4
LT		 792 goto out1;
793
eca6f534 794 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 795 if (retval < 0)
796 goto out2;
797
eca6f534 798 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 799 if (retval < 0)
800 goto out3;
801
802 retval = -EINVAL;
803
eca6f534 804 if (kernel_type && data_page) {
2116b7a4 805 if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 806 do_ncp_super_data_conv((void *)data_page);
eca6f534 807 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 808 if (do_nfs4_super_data_conv((void *) data_page))
809 goto out4;
1da177e4
LT		 810 }
811 }
812
91a27b2a 813 retval = do_mount(kernel_dev, dir->name, kernel_type,
1da177e4 814 flags, (void*)data_page);
1da177e4 815
9a9947bf 816 out4:
1da177e4
LT		 817 free_page(data_page);
818 out3:
eca6f534 819 kfree(kernel_dev);
1da177e4 820 out2:
91a27b2a 821 putname(dir);
1da177e4 822 out1:
eca6f534 823 kfree(kernel_type);
1da177e4
LT		 824 out:
825 return retval;
826}
827
1da177e4
LT		 828struct compat_old_linux_dirent {
829 compat_ulong_t d_ino;
830 compat_ulong_t d_offset;
831 unsigned short d_namlen;
832 char d_name[1];
833};
834
835struct compat_readdir_callback {
836 struct compat_old_linux_dirent __user *dirent;
837 int result;
838};
839
840static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 841 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 842{
843 struct compat_readdir_callback *buf = __buf;
844 struct compat_old_linux_dirent __user *dirent;
afefdbb2 845 compat_ulong_t d_ino;
1da177e4
LT		 846
847 if (buf->result)
848 return -EINVAL;
afefdbb2 849 d_ino = ino;
8f3f655d
AV		 850 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
851 buf->result = -EOVERFLOW;
afefdbb2 852 return -EOVERFLOW;
8f3f655d 853 }
1da177e4
LT		 854 buf->result++;
855 dirent = buf->dirent;
856 if (!access_ok(VERIFY_WRITE, dirent,
857 (unsigned long)(dirent->d_name + namlen + 1) -
858 (unsigned long)dirent))
859 goto efault;
afefdbb2 860 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 861 __put_user(offset, &dirent->d_offset) ||
862 __put_user(namlen, &dirent->d_namlen) ||
863 __copy_to_user(dirent->d_name, name, namlen) ||
864 __put_user(0, dirent->d_name + namlen))
865 goto efault;
866 return 0;
867efault:
868 buf->result = -EFAULT;
869 return -EFAULT;
870}
871
872asmlinkage long compat_sys_old_readdir(unsigned int fd,
873 struct compat_old_linux_dirent __user *dirent, unsigned int count)
874{
875 int error;
2903ff01 876 struct fd f = fdget(fd);
1da177e4
LT		 877 struct compat_readdir_callback buf;
878
2903ff01 879 if (!f.file)
863ced7f 880 return -EBADF;
1da177e4
LT		 881
882 buf.result = 0;
883 buf.dirent = dirent;
884
2903ff01 885 error = vfs_readdir(f.file, compat_fillonedir, &buf);
53c9c5c0 886 if (buf.result)
1da177e4
LT		 887 error = buf.result;
888
2903ff01 889 fdput(f);
1da177e4
LT		 890 return error;
891}
892
893struct compat_linux_dirent {
894 compat_ulong_t d_ino;
895 compat_ulong_t d_off;
896 unsigned short d_reclen;
897 char d_name[1];
898};
899
900struct compat_getdents_callback {
901 struct compat_linux_dirent __user *current_dir;
902 struct compat_linux_dirent __user *previous;
903 int count;
904 int error;
905};
906
907static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 908 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 909{
910 struct compat_linux_dirent __user * dirent;
911 struct compat_getdents_callback *buf = __buf;
afefdbb2 912 compat_ulong_t d_ino;
85c9fe8f
KW		 913 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
914 namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 915
916 buf->error = -EINVAL; /* only used if we fail.. */
917 if (reclen > buf->count)
918 return -EINVAL;
afefdbb2 919 d_ino = ino;
8f3f655d
AV		 920 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
921 buf->error = -EOVERFLOW;
afefdbb2 922 return -EOVERFLOW;
8f3f655d 923 }
1da177e4
LT		 924 dirent = buf->previous;
925 if (dirent) {
926 if (__put_user(offset, &dirent->d_off))
927 goto efault;
928 }
929 dirent = buf->current_dir;
afefdbb2 930 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 931 goto efault;
932 if (__put_user(reclen, &dirent->d_reclen))
933 goto efault;
934 if (copy_to_user(dirent->d_name, name, namlen))
935 goto efault;
936 if (__put_user(0, dirent->d_name + namlen))
937 goto efault;
938 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
939 goto efault;
940 buf->previous = dirent;
941 dirent = (void __user *)dirent + reclen;
942 buf->current_dir = dirent;
943 buf->count -= reclen;
944 return 0;
945efault:
946 buf->error = -EFAULT;
947 return -EFAULT;
948}
949
950asmlinkage long compat_sys_getdents(unsigned int fd,
951 struct compat_linux_dirent __user *dirent, unsigned int count)
952{
2903ff01 953 struct fd f;
1da177e4
LT		 954 struct compat_linux_dirent __user * lastdirent;
955 struct compat_getdents_callback buf;
956 int error;
957
1da177e4 958 if (!access_ok(VERIFY_WRITE, dirent, count))
863ced7f 959 return -EFAULT;
1da177e4 960
2903ff01
AV		 961 f = fdget(fd);
962 if (!f.file)
863ced7f 963 return -EBADF;
1da177e4
LT		 964
965 buf.current_dir = dirent;
966 buf.previous = NULL;
967 buf.count = count;
968 buf.error = 0;
969
2903ff01 970 error = vfs_readdir(f.file, compat_filldir, &buf);
53c9c5c0
AV		 971 if (error >= 0)
972 error = buf.error;
1da177e4
LT		 973 lastdirent = buf.previous;
974 if (lastdirent) {
2903ff01 975 if (put_user(f.file->f_pos, &lastdirent->d_off))
1da177e4
LT		 976 error = -EFAULT;
977 else
978 error = count - buf.count;
979 }
2903ff01 980 fdput(f);
1da177e4
LT		 981 return error;
982}
983
984#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 985
986struct compat_getdents_callback64 {
987 struct linux_dirent64 __user *current_dir;
988 struct linux_dirent64 __user *previous;
989 int count;
990 int error;
991};
992
993static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 994 u64 ino, unsigned int d_type)
1da177e4
LT		 995{
996 struct linux_dirent64 __user *dirent;
997 struct compat_getdents_callback64 *buf = __buf;
85c9fe8f
KW		 998 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
999 sizeof(u64));
1da177e4
LT		 1000 u64 off;
1001
1002 buf->error = -EINVAL; /* only used if we fail.. */
1003 if (reclen > buf->count)
1004 return -EINVAL;
1005 dirent = buf->previous;
1006
1007 if (dirent) {
1008 if (__put_user_unaligned(offset, &dirent->d_off))
1009 goto efault;
1010 }
1011 dirent = buf->current_dir;
1012 if (__put_user_unaligned(ino, &dirent->d_ino))
1013 goto efault;
1014 off = 0;
1015 if (__put_user_unaligned(off, &dirent->d_off))
1016 goto efault;
1017 if (__put_user(reclen, &dirent->d_reclen))
1018 goto efault;
1019 if (__put_user(d_type, &dirent->d_type))
1020 goto efault;
1021 if (copy_to_user(dirent->d_name, name, namlen))
1022 goto efault;
1023 if (__put_user(0, dirent->d_name + namlen))
1024 goto efault;
1025 buf->previous = dirent;
1026 dirent = (void __user *)dirent + reclen;
1027 buf->current_dir = dirent;
1028 buf->count -= reclen;
1029 return 0;
1030efault:
1031 buf->error = -EFAULT;
1032 return -EFAULT;
1033}
1034
1035asmlinkage long compat_sys_getdents64(unsigned int fd,
1036 struct linux_dirent64 __user * dirent, unsigned int count)
1037{
2903ff01 1038 struct fd f;
1da177e4
LT		 1039 struct linux_dirent64 __user * lastdirent;
1040 struct compat_getdents_callback64 buf;
1041 int error;
1042
1da177e4 1043 if (!access_ok(VERIFY_WRITE, dirent, count))
863ced7f 1044 return -EFAULT;
1da177e4 1045
2903ff01
AV		 1046 f = fdget(fd);
1047 if (!f.file)
863ced7f 1048 return -EBADF;
1da177e4
LT		 1049
1050 buf.current_dir = dirent;
1051 buf.previous = NULL;
1052 buf.count = count;
1053 buf.error = 0;
1054
2903ff01 1055 error = vfs_readdir(f.file, compat_filldir64, &buf);
53c9c5c0
AV		 1056 if (error >= 0)
1057 error = buf.error;
1da177e4
LT		 1058 lastdirent = buf.previous;
1059 if (lastdirent) {
2903ff01 1060 typeof(lastdirent->d_off) d_off = f.file->f_pos;
7116e994 1061 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1062 error = -EFAULT;
1063 else
1064 error = count - buf.count;
1da177e4 1065 }
2903ff01 1066 fdput(f);
1da177e4
LT		 1067 return error;
1068}
1069#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1070
e922efc3
MS		 1071/*
1072 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1073 * O_LARGEFILE flag.
1074 */
f482e1b4 1075COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
e922efc3 1076{
5590ff0d
UD		 1077 return do_sys_open(AT_FDCWD, filename, flags, mode);
1078}
1079
1080/*
1081 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1082 * O_LARGEFILE flag.
1083 */
f482e1b4 1084COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
5590ff0d
UD		 1085{
1086 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1087}
1088
1da177e4
LT		 1089#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1090
b773ad40
TG		 1091static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1092 int timeval, int ret)
1093{
1094 struct timespec ts;
1095
1096 if (!p)
1097 return ret;
1098
1099 if (current->personality & STICKY_TIMEOUTS)
1100 goto sticky;
1101
1102 /* No update for zero timeout */
1103 if (!end_time->tv_sec && !end_time->tv_nsec)
1104 return ret;
1105
1106 ktime_get_ts(&ts);
1107 ts = timespec_sub(*end_time, ts);
1108 if (ts.tv_sec < 0)
1109 ts.tv_sec = ts.tv_nsec = 0;
1110
1111 if (timeval) {
1112 struct compat_timeval rtv;
1113
1114 rtv.tv_sec = ts.tv_sec;
1115 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1116
1117 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1118 return ret;
1119 } else {
1120 struct compat_timespec rts;
1121
1122 rts.tv_sec = ts.tv_sec;
1123 rts.tv_nsec = ts.tv_nsec;
1124
1125 if (!copy_to_user(p, &rts, sizeof(rts)))
1126 return ret;
1127 }
1128 /*
1129 * If an application puts its timeval in read-only memory, we
1130 * don't want the Linux-specific update to the timeval to
1131 * cause a fault after the select has completed
1132 * successfully. However, because we're not updating the
1133 * timeval, we can't restart the system call.
1134 */
1135
1136sticky:
1137 if (ret == -ERESTARTNOHAND)
1138 ret = -EINTR;
1139 return ret;
1140}
1141
1da177e4
LT		 1142/*
1143 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1144 * 64-bit unsigned longs.
1145 */
858119e1 1146static
1da177e4
LT		 1147int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1148 unsigned long *fdset)
1149{
022a1692 1150 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1151 if (ufdset) {
1152 unsigned long odd;
1153
1154 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1155 return -EFAULT;
1156
1157 odd = nr & 1UL;
1158 nr &= ~1UL;
1159 while (nr) {
1160 unsigned long h, l;
7116e994
HC		 1161 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1162 return -EFAULT;
1da177e4
LT		 1163 ufdset += 2;
1164 *fdset++ = h << 32 | l;
1165 nr -= 2;
1166 }
7116e994
HC		 1167 if (odd && __get_user(*fdset, ufdset))
1168 return -EFAULT;
1da177e4
LT		 1169 } else {
1170 /* Tricky, must clear full unsigned long in the
1171 * kernel fdset at the end, this makes sure that
1172 * actually happens.
1173 */
1174 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1175 }
1176 return 0;
1177}
1178
858119e1 1179static
7116e994
HC		 1180int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1181 unsigned long *fdset)
1da177e4
LT		 1182{
1183 unsigned long odd;
022a1692 1184 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1185
1186 if (!ufdset)
7116e994 1187 return 0;
1da177e4
LT		 1188
1189 odd = nr & 1UL;
1190 nr &= ~1UL;
1191 while (nr) {
1192 unsigned long h, l;
1193 l = *fdset++;
1194 h = l >> 32;
7116e994
HC		 1195 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1196 return -EFAULT;
1da177e4
LT		 1197 ufdset += 2;
1198 nr -= 2;
1199 }
7116e994
HC		 1200 if (odd && __put_user(*fdset, ufdset))
1201 return -EFAULT;
1202 return 0;
1da177e4
LT		 1203}
1204
1205
1206/*
1207 * This is a virtual copy of sys_select from fs/select.c and probably
1208 * should be compared to it from time to time
1209 */
1da177e4
LT		 1210
1211/*
1212 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1213 * like to be certain this leads to no problems. So I return
1214 * EINTR just for safety.
1215 *
1216 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1217 * I'm trying ERESTARTNOHAND which restart only when you want to.
1218 */
9f72949f 1219int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1220 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1221 struct timespec *end_time)
1da177e4
LT		 1222{
1223 fd_set_bits fds;
6087b2da 1224 void *bits;
bbea9f69 1225 int size, max_fds, ret = -EINVAL;
a4531edd 1226 struct fdtable *fdt;
6087b2da 1227 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1228
1da177e4
LT		 1229 if (n < 0)
1230 goto out_nofds;
1231
bbea9f69 1232 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1233 rcu_read_lock();
a4531edd 1234 fdt = files_fdtable(current->files);
bbea9f69 1235 max_fds = fdt->max_fds;
ac5b8b6f 1236 rcu_read_unlock();
bbea9f69
VL		 1237 if (n > max_fds)
1238 n = max_fds;
1da177e4
LT		 1239
1240 /*
1241 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1242 * since we used fdset we need to allocate memory in units of
1243 * long-words.
1244 */
1da177e4 1245 size = FDS_BYTES(n);
6087b2da
BP		 1246 bits = stack_fds;
1247 if (size > sizeof(stack_fds) / 6) {
1248 bits = kmalloc(6 * size, GFP_KERNEL);
1249 ret = -ENOMEM;
1250 if (!bits)
1251 goto out_nofds;
1252 }
1da177e4
LT		 1253 fds.in = (unsigned long *) bits;
1254 fds.out = (unsigned long *) (bits + size);
1255 fds.ex = (unsigned long *) (bits + 2*size);
1256 fds.res_in = (unsigned long *) (bits + 3*size);
1257 fds.res_out = (unsigned long *) (bits + 4*size);
1258 fds.res_ex = (unsigned long *) (bits + 5*size);
1259
1260 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1261 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1262 (ret = compat_get_fd_set(n, exp, fds.ex)))
1263 goto out;
1264 zero_fd_set(n, fds.res_in);
1265 zero_fd_set(n, fds.res_out);
1266 zero_fd_set(n, fds.res_ex);
1267
8ff3e8e8 1268 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1269
1270 if (ret < 0)
1271 goto out;
1272 if (!ret) {
1273 ret = -ERESTARTNOHAND;
1274 if (signal_pending(current))
1275 goto out;
1276 ret = 0;
1277 }
1278
7116e994
HC		 1279 if (compat_set_fd_set(n, inp, fds.res_in) ||
1280 compat_set_fd_set(n, outp, fds.res_out) ||
1281 compat_set_fd_set(n, exp, fds.res_ex))
1282 ret = -EFAULT;
1da177e4 1283out:
6087b2da
BP		 1284 if (bits != stack_fds)
1285 kfree(bits);
1da177e4
LT		 1286out_nofds:
1287 return ret;
1288}
1289
9f72949f
DW		 1290asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1291 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1292 struct compat_timeval __user *tvp)
1293{
8ff3e8e8 1294 struct timespec end_time, *to = NULL;
9f72949f
DW		 1295 struct compat_timeval tv;
1296 int ret;
1297
1298 if (tvp) {
1299 if (copy_from_user(&tv, tvp, sizeof(tv)))
1300 return -EFAULT;
1301
8ff3e8e8 1302 to = &end_time;
4d36a9e6
AV		 1303 if (poll_select_set_timeout(to,
1304 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1305 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1306 return -EINVAL;
9f72949f
DW		 1307 }
1308
8ff3e8e8
AV		 1309 ret = compat_core_sys_select(n, inp, outp, exp, to);
1310 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1311
1312 return ret;
1313}
1314
5d0e5283
CH		 1315struct compat_sel_arg_struct {
1316 compat_ulong_t n;
1317 compat_uptr_t inp;
1318 compat_uptr_t outp;
1319 compat_uptr_t exp;
1320 compat_uptr_t tvp;
1321};
1322
1323asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1324{
1325 struct compat_sel_arg_struct a;
1326
1327 if (copy_from_user(&a, arg, sizeof(a)))
1328 return -EFAULT;
1329 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1330 compat_ptr(a.exp), compat_ptr(a.tvp));
1331}
1332
c9da9f21 1333static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1334 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1335 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1336 compat_size_t sigsetsize)
1337{
1338 compat_sigset_t ss32;
1339 sigset_t ksigmask, sigsaved;
9f72949f 1340 struct compat_timespec ts;
8ff3e8e8 1341 struct timespec end_time, *to = NULL;
9f72949f
DW		 1342 int ret;
1343
1344 if (tsp) {
1345 if (copy_from_user(&ts, tsp, sizeof(ts)))
1346 return -EFAULT;
1347
8ff3e8e8
AV		 1348 to = &end_time;
1349 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1350 return -EINVAL;
1351 }
1352
1353 if (sigmask) {
1354 if (sigsetsize != sizeof(compat_sigset_t))
1355 return -EINVAL;
1356 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1357 return -EFAULT;
1358 sigset_from_compat(&ksigmask, &ss32);
1359
1360 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1361 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1362 }
1363
8ff3e8e8
AV		 1364 ret = compat_core_sys_select(n, inp, outp, exp, to);
1365 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1366
1367 if (ret == -ERESTARTNOHAND) {
1368 /*
1369 * Don't restore the signal mask yet. Let do_signal() deliver
1370 * the signal on the way back to userspace, before the signal
1371 * mask is restored.
1372 */
1373 if (sigmask) {
1374 memcpy(&current->saved_sigmask, &sigsaved,
1375 sizeof(sigsaved));
4e4c22c7 1376 set_restore_sigmask();
9f72949f
DW		 1377 }
1378 } else if (sigmask)
1379 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1380
1381 return ret;
1382}
1383
1384asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1385 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1386 struct compat_timespec __user *tsp, void __user *sig)
1387{
1388 compat_size_t sigsetsize = 0;
1389 compat_uptr_t up = 0;
1390
1391 if (sig) {
1392 if (!access_ok(VERIFY_READ, sig,
1393 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1394 __get_user(up, (compat_uptr_t __user *)sig) ||
1395 __get_user(sigsetsize,
1396 (compat_size_t __user *)(sig+sizeof(up))))
1397 return -EFAULT;
1398 }
c9da9f21
HC		 1399 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1400 sigsetsize);
9f72949f
DW		 1401}
1402
1403asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1404 unsigned int nfds, struct compat_timespec __user *tsp,
1405 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1406{
1407 compat_sigset_t ss32;
1408 sigset_t ksigmask, sigsaved;
1409 struct compat_timespec ts;
8ff3e8e8 1410 struct timespec end_time, *to = NULL;
9f72949f
DW		 1411 int ret;
1412
1413 if (tsp) {
1414 if (copy_from_user(&ts, tsp, sizeof(ts)))
1415 return -EFAULT;
1416
8ff3e8e8
AV		 1417 to = &end_time;
1418 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1419 return -EINVAL;
9f72949f
DW		 1420 }
1421
1422 if (sigmask) {
3835a9bd 1423 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1424 return -EINVAL;
1425 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1426 return -EFAULT;
1427 sigset_from_compat(&ksigmask, &ss32);
1428
1429 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1430 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1431 }
1432
8ff3e8e8 1433 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1434
1435 /* We can restart this syscall, usually */
1436 if (ret == -EINTR) {
1437 /*
1438 * Don't restore the signal mask yet. Let do_signal() deliver
1439 * the signal on the way back to userspace, before the signal
1440 * mask is restored.
1441 */
1442 if (sigmask) {
1443 memcpy(&current->saved_sigmask, &sigsaved,
1444 sizeof(sigsaved));
4e4c22c7 1445 set_restore_sigmask();
9f72949f
DW		 1446 }
1447 ret = -ERESTARTNOHAND;
1448 } else if (sigmask)
1449 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1450
8ff3e8e8 1451 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1452
1453 return ret;
1454}
9f72949f 1455
becfd1f3
AK		 1456#ifdef CONFIG_FHANDLE
1457/*
1458 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1459 * doesn't set the O_LARGEFILE flag.
1460 */
f482e1b4
AV		 1461COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1462 struct file_handle __user *, handle, int, flags)
becfd1f3
AK		 1463{
1464 return do_handle_open(mountdirfd, handle, flags);
1465}
1466#endif
kernel source for telekom puls (alcatel/mediatek)